Data recovery is the process of salvaging data from damaged, failed, corrupted, or
inaccessible secondary storage media when it cannot be accessed normally. Often the data
are being salvaged from storage media such as internal or external hard disk drives, solidstate drives (SSD), USB flash drive, storage tapes, CDs, DVDs, RAID, and other
electronics. Recovery may be required due to physical damage to the storage device or
logical damage to the file system that prevents it from being mounted by the host
operating system.
The most common "data recovery" scenario involves an operating system (OS) failure
(typically on a single-disk, single-partition, single-OS system), in which case the goal is
simply to copy all wanted files to another disk. This can be easily accomplished using a
Live CD, many of which provide a means to mount the system drive and backup disks or
removable media, and to move the files from the system disk to the backup media with a
file manager or optical disc authoring software. Such cases can often be mitigated by disk
partitioning and consistently storing valuable data files (or copies of them) on a different
partition from the replaceable OS system files.[1]
Another scenario involves a disk-level failure, such as a compromised file system or disk
partition, or a hard disk failure. In any of these cases, the data cannot be easily read.
Depending on the situation, solutions involve repairing the file system, partition table or
master boot record, or hard disk recovery techniques ranging from software-based
recovery of corrupted data, hardware-software based recovery of damaged service areas
(also known as the hard drive's "firmware"), to hardware replacement on a physically
damaged disk. If hard disk recovery is necessary, the disk itself has typically failed
permanently, and the focus is rather on a one-time recovery, salvaging whatever data can
be read.
In a third scenario, files have been "deleted" from a storage medium. Typically, the
contents of deleted files are not removed immediately from the drive; instead, references
to them in the directory structure are removed, and the space they occupy is made
available for later overwriting. In the meantime, the original file contents remain, often in
a number of disconnected fragments, and may be recoverable.
The term "data recovery" is also used in the context of forensic applications or espionage,
where data which has been encrypted or hidden, rather than damaged, is recovered.[2]
PhotoPaint
Corel Photo-Paint is a raster graphics editor developed and marketed by Corel since
1992. Photo-Paint's native format is .CPT (Corel Photo-Paint Image), which stores image
data as well as information within an image, including objects (layers in some raster
editors), colour profiles, text, transparency, effect filters. Corel Photo-Paint allows an
image to be edited in multiple layers, called objects here. A gradient line going from
opaque to transparent, for instance, can be used to have a darker foreground color fade
into a lighter background color. The UI is highly customizable, and the user can freely
move dialogs or adjust button sizes and such. Effects can be applied to a picture including
Smart Blur -- a type of Gaussian blur effect which however retains sharpness around
sharper edges -- Mesh Warp, Camera Lens Flare, Trace Contour and others. There is
limited support for vector paths to be integrated. Depending on personal preferences and
work style, users may prefer Corel Photo-Paint over Adobe Photoshop or the other way
round, though in terms of market share, Photoshop is clearly more represented